[DNM][WiP][PoC] userspace LL scheduling: LLEXT & multicore #23880

Job	Run time
LP64-WIP	3m 35s
manifest-check	2m 53s
build-linux (mnfst, ptl)	3m 26s
build-linux (mnfst, tgl)	3m 15s
build-linux (mnfst, imx8m imx8ulp)	3m 15s
build-linux (mnfst, lnl)	3m 47s
build-windows (mnfst, lnl)	7m 58s
build-windows (mnfst, tgl-h)	7m 21s
build-linux (-d, mnfst, lnl)	3m 33s
build-windows (mnfst, imx8 imx8x)	8m 36s
build-windows (mnfst, mtl)	7m 25s
build-windows (mnfst, ptl)	7m 27s
build-windows (mnfst, tgl)	7m 33s
build-windows (-d, mnfst, lnl)	6m 32s
build-linux (mnfst, tgl-h)	3m 20s
build-windows (mnfst, imx8m imx8ulp)	7m 25s
build-linux (mnfst, imx8 imx8x)	3m 27s
build-linux (mnfst, mtl)	3m 26s
build-linux (mnfst, wcl imx95)	3m 23s
compare-linux-win	21s
	1h 37m 58s

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